Crash as soon as I start to move

As the title says I’ve recently started having a problem where I can download the server files fine, join in, even look around while standing in place and type in chat, but as soon as I try to move with the WASD keys, my game freeze and suddenly I’m back at my desktop with the program closed. No error message or anything. I try to move and ‘pop!’ I’m back at the desktop. I’ve never had this happen before. I’ve always played on servers just fine with decent video settings, but even after turning all my settings down as low as possible I am unable to phyiscally move around in a server. Does anyone know how to resolve this?